Key action for typewriters and other machines



' May 27, 1930.

O. U. DESHA KEY ACTION FOR TYPEWRITERS AND OTHER MACHINES v Filed Janv 2'7, 1928 2 Sheets-Sheet 1 May 27, 1930. o. u. DESHA 1,760,269

KEY ACTION FOR TYPEWRITERS AND OTHER MACHINES Filed Jan. 27, 1928 2 Sheets-Sheet 2 Patented May 27, 1930 ORVILLE U. DESHA, OF FORT COLLINS, COLORADO, ASSIGNOR OF ONE-FIFTH TO THE DESI-IA TYPELEX TRUST ESTATE, OF FORT COLLEHS, COLORADO KEY ACTION FOB TYPEWRI'I'ER-S AND OTHER MACHINES Application filerl January 27, 1928. Serial No. 249,877.

in regard to certain more specific features my invention relates to improvements in the associated and coacting parts of a key mechanism of a machine whose actuatin means pcratively connecting the type bar and key lever more the type bar to printing point upon depression of the key lever; said mechani m embodying coacting means reversely breaking the connection effected by the said connecting actuating means after the printing impact of the type bar for the return of he type bar to its normal position whilethe cey lever is in depressed position; and also including coacting means for restoring said connection to normal operative position upon release of the key lever; this broad object leing the subject matter of an application I i by me on November 5th, 1923, Serial 872,871, upon which Patent 1,643,203

0 ssue? Sept. 20, 1927, as a contradistinction the no key lever and type bar after the latte" has been given the movement necessary 0 effect the printing and before the key lever as completed its cycle of movement.

Among the objects of the present invention, the applicant has endeavored: First, to improve the connection between the key lever and type bar which will provide, among other features, a key action which will be eiiicient in use, rapid and reliable in operation, and which shall have a light touch for operating the type bars, and reduce the liability of the type to collide or pile when operated at high speed. Second, to provide a key mechanism of the above character having few parts simple in construction which will be cheap to manufacture, convenient and easy to arrange and assemble compactly, and construct a key mechanism as to be but little likely to get out of order in usual operation. The applicant also endeavors to point out a clear distinction between this and his copending applications Serial No. 55,227 filed September 8, 1925 and Serial Nos. 178,088, 178,084, 178,085, 178,086, 178,087, 178,088 and 178,089 filed March 24, 1927.

My invention, accordingly, consists in cereo tain combinations of elements, features of construction, and arrangements of parts, that may readily be incorporated in certain type writing machines with only slight modification of the structural features of said machines as they now exist exemplified in the construction hereinafter set forth which will be more readily understood from an inspection of the accompanying two sheets of drawings and the following specifications, the scope of the invention being indicated in the appended claims.

My invention is especially applicable to the usual hand operating machine, as dis tinguished from a motor driven machine, and is shown in the present case embodied in a machine similar to the Royal standard typewriter. It should be understood, however, that the invention is not restricted to use me. machine of this type, but may be employed wherever found available.

The applicant has endeavored to disclose and describe the construction of the mechanism and manner of its operation and its use in language comprehensible to those versed or skilled in the art who would make or use the device, suficient to satisfy the requisites of this application without enumerating every obvious obj ectand advantage, or pointing out all the difficulties and troubles which are cured or ameliorated by his improvement over the present state of the art.

Fig. I is a sectional elevation of a typewriting machine taken longitudinally and about centrally thereof, constructed in accordance with my invention and showing 'elements of one key action only in normal position, and also showing so much of the usual mechanism as is necessary to illustrate how my invention may be embodied in such machine. Fig. 11, represents a View of the keymechanism similar to Fig. I, the key lever being shown depressed and responding the type bar. Fig. III is a key mechanism similar to Fig. I, the key lever being shown in a depressed position and the type bar responded to printing position. Fig. IV is also a key mechanism similar to Fig. I, the key lever being shown in a depressed position and the type bar returned to its initial position. In this manner the key lever may be held down referred to above.

to its limit of movement and the type bar will complete its path of travel to effect the print 7 ing and move out of engagement with the platen and complete its cycle of movement re gardless of whether or not the key lever is released, thus relieving the key lever of work during the impact printing operation.

The following detailed description sets forth the best mode in which the applicant has contemplated applying the invention. It is understood, of course, that for the sake of clearness and to avoid complication of drawings, elements of the complete machine already known to the art constituting no part of the present invention and statements of mere obvious facts are omitted.

in the accompanying drawings similar reference characters indicate corresponding parts in the several views, and in order to facilitate observance of a clear distinction between this and copending application, the reference characters also indicate, as far as practical, the corresponding parts in the several views of my copending applications In the embodiment in Fig. I, more in detail, in which one form of type action is shown as applied to a typewriting machie to which it is particularly adapted, 1 indicates the typewriter frame 1 indicating the front and 1 the rear.

indicates a common platen mounted as usual to travel longitudinally across the rear upper portion of the machineupon a carriage mechanism. As the carriage mechanism forms no part of the present invention specific disclosure and description thereof is omitted as its broad function is Well known. 6 indicates one of a series of type bars being radially arranged in a curved row about the same center and are movable about their fulcrum pivot rod 9 on a type bar segment 10, Fig. I, from a horizontal or forwardly extending radial position E as the type 7 forms are G and is brought against the front face of the platen 5 to a common printing point A, to an upright radial position as shown by radius F; the type 7 printing by impact in contradistinction topressure. 12 indicates one of a series of key levers carrying at the front end finger key 13, the rear end pivoted at 14 to bar 143* in the rear of the machine, and is kept normally in its elevated position by the usual spring 15 supported by bar 15 at normal rest the key lever bearing against the underside of stop bar 15 above the key lever 12. Key lever 12 is formed with an upward angular arm 16 with a rear vertex 16 and with a forearm 16 extending forwardly. Said arm provides an operative plane forwardly thereof and beneaththe forearm and above the key lever for the operation of a reversely breaking actuating coupling hereinafter described. 17 indicates a key lever arrestor beneath the key lever which limits the downward movement of the latter. 18

indicates one of a series of rearwardly disposed vibratory levers corresponding in number with the type bars 6 and key levers 12. Forward ends of the vibratory levers 18 are pivoted at 19 supported by abar 20, Fig. I, extending across the machine near the front of the latter, the operative cycle of said vibratory lever corresponding with the operative cycle of the type bar only and not simultaneously with the operative cycle of the key lever. 21 indicates a forward pull link, rear end thereofroperatively connecting the type bar 6 at 6 and the forward end operatively connecting the vibratory lever 18 at 18 21 is a fixed stop collar near the rear end of the forward pull link 21, and 21 is a fixed stop collar near the forward end of said pull link 21.

The key lever 12 is described as having two incidents of operation before completing its operative cycle, namely; the incident of depression and the incident of release. The in cident of depression is disclosed by the movement of the key lever 12 from radius B to radius C, and the incident of release is disclosed by the movement of the key lever 12 back from radius C to radius B. The type bar '6 is described as having two incidents of operation, in completing its operative cycle,

namely; incident of response and incident of recoil. The incident of response of the type bar 6 isdisclosed by the movement of the type bar from its initial rest radius E to printing point A, at radius F, forming arc Gr from pivot- 9. The incident of recoil of type bar 6 is disclosed by its movement from the printing point A back to normal rest E thereby completing its operative cycle. These incidents of operation are, of course, common in nonreversely breaking type bar actions in so far as the incident of response, E to A, of the type bar 6 occurs simultaneously with the incident of depression, B to C, of key lever 12, and the incident of recoil, A to E, of the type bar occur simultaneously with the incident of release, G to B, of the key lever. In other words, the operative cycle of the type bar and that of the key lever are simultaneous in a nonreversely breaking connection, but the broad function inherent to the present key action relative to the correlation of incidents of operation of the key lever with that of the type bar is in providingthe operative expedient by which both the incident of response, E to A, of the type bar and the incident of recoil, A to E, occur during the one incident of depression, B to G, of the key lever, the type bar completing its 0perative cycle while the operative cycle of the key lever is only half complete. This operative expedient is accomplished in this case by a trip link coupling comprising a downward draw link 22 and a downward thrust link 23. The upper end of the downward draw link 22 operatively connects the vibratory lever 18 at intermediately the ends of said vibratory lever and extends downwardly and operating in a plane above the key lever, the lower end of said draw link 22 being pivotally connected at 24 to the lower ends of the thrust link 23 above the key lever 12. The upper end of the downward thrust link 23 is pivoted at 26 to the forearm 16 of the upward angular arm 16 of the key lever 12. The pivotal connection 26 is a novel pin and slot connection the pivot head 26 being elongated in shape instead of round, said shape permitting it being slipped through a corresponding elongated hole 23 provided by the upward end of thrust link 23 the normal position of said. elongated pivot head 26 and elongated hole 28 being perpendicular as shown in Fig. I, and it will be seen that the elongated hole 23 provided by the downward thrust link 23 is eccentric relative to the fulcrum pivot 24:

of said thrust link his eccentric relationship prevents the elongated pivot head 26 and elongated hole 23 from moving parallel to each other at any time during operation.

It is necessary that drawlink 22 be of such length and of such form as to permit the normal position of pivotal connection 26 to oscillate between the pivotal ends 24 and 25 of said draw link in order that pivotal connection 24 may cross and recross a reversely breaking line J J drawn through the pivots 25 and 26 thereby permitting-the elements 22 and 23 of said coupling to be folded during normal operative position, Fig. I, moving the type bar 6 to printing point upon depression of the key lever and said parts 22 and 23 to assume an unfolded position, Figs. 11, Ill and IV, while the type bar returns to normal position, the characteristic form of the downward draw link 22, therefore, is mixtilineal the lower part 22 being preferably conveXed forwardly and the up per part 22 being straight; and the draw link 22 is the major in length, the thrust link 23 being the minor in length, of the elements of said reversely breaking actuating coupling. about the circumference of the pull link 21. This spring hereinafter is designated as actuating return spring. Forward end of return spring 27 is controlled by fixed stop collar 21*. 28 is an actuating thrust rod and the rear end thereof is pivoted at 28 to a slidable sleeve 28 carried by the forward pull link2i, and the forward end of said actuating thrust rod 28 is pivoted at 28 to the downward draw link 22 intermediately the ends of the latter. 29 is a preadjusted noise absorbing buffer bar extending across themachine above the key lever and in the rear of the draw link 22 determining the normal operative position of said draw link 22. is a frictionless roller bearing carried by draw link 22 intermediately the ends of the latter and the operative 27 is a push wire spring coiled position of the tread of said bearing is communicative with the front face of said bufier bar 29. Front face 29 of said buffer bar 29 is provided with material to deaden the concussion.

The new mechanical structure, combination of parts and operation thereofare the important factors of the invention in pro viding the desired function of the'key action. A further description of the operative through the upper border of the actuating plane thence downward through the intermediate pivotal connection 26. At'this stage of operation it will be seen that the intermediate pivotal connection 26 is within the backward concavity of the draw link 22. This position operatively interlocks the elements 22 and 23 of said coupling effecting response of the type bar 6 upon depression of the key lever 12 Dotted line M M, Fig. II, shows where the actuating, thrust rod 28 by means of its supporting. sleeve 28 communicating with the fixed collar 21 has diverted the downward movement of the draw link 22 forwardly and has thereby moved the pivotal connection 24 forwardly across'and in front of the reversely breaking line J J drawn through pivotal connections 25 and 26, the elements of said coupling assuming this position about the time the type bar 6 responds to about one-half of its incident of response, as shown by Ea in Fig. II. The momentum of the type bar completes the incident of response of the latter to printing point A, as shown in Fig. III. At this stage of opera tion it willbe seen that the intermediate pivotal connection 26 is without the backward concavity of the draw link 22. Dotted line M M, Fig. III, shows where the actuating thrust rod 28 has diverted the downward movement of the draw link 22 forwardly and the lower border pivotal connection 24 connecting the thrust link and draw link has moved further downwardly and forwardly away from the reversely breaking line J J drawn through the pivotal connection 25 and 26. At this stage of operation it will be seen that the pin and slot connection 26 connecting the thrust link to the key lever arm 16 efiects elongation of the reversely breaking actuating couplingpermitting momentum to carry the type bar 6 fromradius Ea to printlid ing point A. The elongating function in herent to the pin and slot connection 26 discloses means performing the operative expedient whereby the type bar may be operated with a relatively short depression stroke of the key lever. Dotted line M M, is ig. IV, shows where the actuating thrust rod 28 has diverted the downward movement of the draw link 22 forward and rotated the thrust link 23 forwardly and upwardly in front of the reversely breaking line 5 J drawn through the upward border pivotal connection 25 and the interior pivotal, connection 26, permitting the type bar 6 to recoil while the key lever remains in depressed position.

In a reversely breaking key action it is desirable that means be provided whereby the key lever may have a relatively short depression stroke for actuating a full response stroke of the type bar to printing point. Inherent to the present reversely breaking key action, the type bar being unrestrained by the absence of a rigid connection between it and the key lever, momentum carries the type 1 bar to the printing point with efficacious impact upon a relatively short depression stroke of the key lever as a contradistinction between the rigid or unchangeable length of the actuating connection between the key lever and type bar of nonreversely breaking keys. This operative expedient is accomplished, in this case, by the elongated pin and slot con nection 26 connecting the upward end of the thrust link 23 and key lever arm 16 in the following manner: By referring to Fig. I, it will be seen that in the normal operative position the pivotal pin 26 engages the downward thrust link at the lower end of the elongated hole 23 provided by the thrust link 23,

. and remains in this position until the type bar 6 reaches a point on are G to about radius Ea upon depression of the key lever, as shown in Fig. 11. At this stage of operation the key lever 12 has reached the limit of its depression stroke, the latter being stopped by the key lever arrestor 17, and the momentum of the type bar continues the movement of the latter to printing pointmoving the downward thrust link longitudinally away from pivot pin 26 to a point about the center of said elongated hole. By this operative eX- pedient of elongating the reversely breaking actuating coupling at its connection with the key lever upon depression of the latter, the type bar 6 of the present invention may be operated with about three-eighths of an inch to one-half of an inch stroke of finger key 13 contrasted with the usual five-eighths of an inch inherent to a nonreversely breaking key action.

Upon a rapid operation of the key lever, the pin and slot connection at pivot 26 permits inomentuin to carry the type bar 6 from its normal position E relatively faster than its corresponding key lever causing elongation of said coupling allowing-th type 6' to complete its incident of response E to F and return from F to E by the time the key" lever completes its incident of depression B to C and is stopped by the key lever arrestor 1?. bar at 11 is substantially simultaneous With the impact of the key leverat 17, thetype completing its cycle of movement while the key levers cycle of movement is only half complete. This operative principle is also accelerated in this case by the weight of the elements connecting the type bar and key lever counterbalancing the weight of the type bar, and also this principle is accelerated in this case by the fact that return spring 27 moves bodily with the actuating connection between the type bar and key lever, the tension of said spring being dorm-ant or inoperative while the type bar moves to printing point upon depression of the key lever. However, where there is no means to retard the recoil of thetype bar, the excessive recoil concussion with the cushion rest 11 is also inherent to a reversely breaking key action. The applicant, therefore, endeavors, in this case, to provide a key action wherein the recoil of the type bar is absorbed by yielding means and practically neutralizing the recoil concussion of the type bar with cushion rest 11. Referring to Fig. IV, it will be seen that while the key lever 12 is depressed the thrust link 23 holds draw link 22 in its forwardly diverted position and in turn the actuating thrust rod 28, by means of the slidable sleeve 28, retards the rear end of spring 27 and as the type bar 6 recoils, it in turn pulls the forward pull link 21 backwardly, and by means of the fixed stop collar 21 contracts or energizes said spring 27 It is this process of contracting the tension of spring 27 which counterbalances the major part of the recoiling energy of the type bar 6 thereby neutralizing the recoil impact of the type bar with cushion 1 rest 11, disclosing the first function of return spring 27.

It is equally important that reliable and rapid means he provided for restoring the elements 22 and 23 of the reversely breaking coupling to normal operative position upon release of the key lever. This is ac- In other words recoil impact of the type silt;

complished by the second function of the return spring 27 in the following manner: It will be noted, in Fig. IV, that the recoil of the type bar 6 to normal position, by means of the forward pull link 21 and fixed stop collar 21 moving backwardly, has contracted or energized the return spring 27 and the I fixed stop collar 21 carried by the forward pull link 21 has moved backwardly away from the slidab'le sleeve 28 and upon release of the key lever 12, as shown in Fig. I, the energy of return spring 27 moves the slidable' sleeve 28 backwardly against the fixed 001- m0 lar 21 and simultaneously the actuating thrust rod pulls the draw link 22 radially backward and again interlocking the thrust link 23 with the key lever 12, and the pivotal connection 24 resumes its normal operative position behind the reversely breaking line J J. It will be seen that should the key lever 12 be released before the type bar has recoiled, the return spring 27 would still effect an interlocked position of elements 22 and 23, and no matter how successively rapid the key lever 12 may be operated, the return spring 27 restores the reversely breaking elements to normal operative position equally as rapid.

It will be seen that the present invention provides a simple and practical type action which will be rapid and efficient in use, accomplishing, among others, all of the objects and advantages above set forth, therefore the operation and method of use of atype action of this character is believed to be perfectly clear from the above description, a, reiteration thereof is believed to be unnecessary. As many changes could be made in the above construction and many apparently widely different embodiments of this invention could be made without departing from the scope thereof it is intended that all matter contained in the above description, or shown in the accompanying drawings, shall be interpreted as illustrative and not in a limiting sense, and variations may be resorted to within the scope of the invention, and portions of the improvement may be used without others.

Having described my invention, what I claim as new and desire to secure by Letters "Patent is:

i so

upward angular arm intermediately the ends of the key lever forming an integralpart of the latter with its forearm extending forwardly providing an operative plane forwardly thereof and beneath the forearm and above the forward portion of the key lever and the pivotal connection of the lower ends of the draw link and thrust link operating within said operative plane operatively interlocking the elements of saidcou'pling moving the type bar to printing point upon depression ofthe key lever, means reversely breaking said coupling for simultaneously returning the vibratory lever,-forward pull'linkand type bar to normal operative position while key lever is held depressed, meansrestoring the elements of said coupling to 'norcoupling to normal operative tively connecting the type bar and key lever comprising a forward pull link, a rearwardly disposed vibratory lever, theforward endof said vibratory lever pivotally supported by a bar extending across the machine near the front of the latter, the operative cycle of said vibratory lever being simultaneous with the operative cycle of the key lever, a reversely breaking actuating coupling operatively connecting the vibratory lever and key lever moving the type bar to the printing point upon depress-ion of the key lever, a slidable sleeve carried by said forward pull link, an

actuating thrust rod operatively connecting 1 said sleeve and reversely breaking actuating coupling, reversely breaking said actuating coupling after printing impact of the type bar for returning the vibratory lever, forward pull link and type bar to normal operative position while the key lever is in depressed position, and restoring said coupling to normal operative position upon release of the key leverLI 3. In atypewriting machine, a type bar, a key lever, means operatively connecting the type bar and key lever comprising a rearwardly disposed vibratory lever in front of the machine, a reversely breaking actuating coupling operatively connecting the vibratory lever and key lever interme'diately the ends of the latter, a forward pull link connecting the type bar and vibratory lever mov ing the type bar to printing point upon depression of the key lever, a fixed stop collar nearthe rear end of the forward pull link,

an actuating thrust rod operatively connecting said rev'ersely breaking actuating coupling, a slidable sleeve carried by said forward pull link in front of the rear'fixed stop collar operatively connecting the actuating thrust rod and communicating withsaid fixed stop collar reversely breaking said coupling after printing impact of the type bar for returning the vibratory lever, forward pull link and type bar to normal operative position while the key lever is in depressed position, and said actuating thrust rodrestoring said position upon release of the key lever.

4. In a type key action and mechanism, a' key lever, a rearwardly disposed vibratory lever, a forward pull link operatively connecting the type bar and vibra-tory lever, a downward thrust link operated by the key lever, a downward draw link operatively connected at its upper endto said vibratory lever intermediately the ends of the lattersaid draw link extending downwardly operating in a plane above the key lever, therlower endiof. said draw link being. pivotally 'connected to the lower end of said thrust link above the key lever said draw link being mixtilineal in form, the upper part being straight and the lower part convexed forwardly-and said draw link being major in length and said thrust link being minor in length of the elements of said rev-ersely breaking actuating coupling reflectingnormally operative interlocked position of said draw link and thrust link moving the type bar to printing point upon depression of the key lever, means reversely breaking said coupling after printing impact of the type bar for returning the type bar to normal position while key lever is in depressed position, means restoring said coupling to normal operative interlocked position upon release of the key lever.

5'. In a key action and mechanism, a type bar, akey lever with an upward angular arm in termed iately of its ends, a rearwa-rdly disposed vibratory lever,- a forward pull-link operatively connecting the type bar and v1- bratory lever, a downward draw link operatsaid vibratory lever, a downward thrust li-nk pivoted to the forearm of said upward angular arm of the key lever said draw link and thrust link constituting a reversely breaking actuating coupling operatively con necting the key lever and vibratory lever moving the vibratory lever downwardly and :movin-g the forward pull l-in-k longitudinally forwardly responding the type bar 'to printing point upon depression of the key lever, a slidable sleeve carried by said forward pull link communicating with a fixed collar on said pull link, an actuating thrust rod carri ed by said sleeve aanddownward draw link diverting the downward movement of said draw link forwardly and rotating said thrust link forwardly and upwardly reversely breaking said coupling after printing impact of thetype bar for returning the vibratory lever, forward :pull linkvand ty'pe bar to norinal operative position while the key lever is in depressed position said actuating thrust rod-also restoring said draw link and thrust link-to normal operative position upon release of the key lever.

:6; In a type key action, a type bar.,a key lever, means operatively connecting the type bar and key lever-comprising a rearwardl-y disposed vibratory lever pivoted :atits forward end, a forward pull link operatively connecting the type bar and rearend of the vibratory lever a reversely breaking actuatconnec tion; operatively connecting the vibratory lever-and key lever-comprising 'a downward drawlink and, a downwardthrust link operatively interlocked for moving the type bar to the printing point upon depression of the key lever, anhactu-atingthrust rod, the rear end thereof pivoted .to a slidable sleeve carried by the forward pull link and the forward-end of said 'actuating-thrust rrod beingpivoted to "the downward draw link intype bar and key lever comprising a vibratory lever, a forward pull link operatively connecting the type bar and vibratory lever, a reversely breaking actuating coupling comprising a downward thrust link actuated by said key lover, a downward draw link operatively connecting the thrustlink and vibra- 7 tory lever, a noise absorbingbu lfer bar extending across the machine above they key lever and in the rear of said draw link, a frictionless roller bearing carried by said i draw link intermediately the ends of the latter and the operative position of the tread of said bearing communicating with the front face of said buffer bar, the latter being provided with material to deaden the concussion and determining the normal radial position of said draw link, and said roller bearing rolling downwardly against the front face of said buffer bar moving the ty pebar to printing point upon depression of the key lever, means diverting the. downward movement of said draw link and frictionless hearing forwardly away from said louder bar reversely breaking said coupling after the printing impact of the type bar for returning the vibratory lever, forward pull link and type bar to 'normal operative position while the key lever is in depressed position, means restoring said draw link and frictionless bearingto normal positionof rest against the for ward face of said buffer bar-upon release of thezkey lever. 7

-.8. Ina key actionand mechanism, a type bar, a key lever providing an upward angular arm intermediately of its ends, means operatively connecting thety-pe bar and key lever comprising a rea'rw-ardly disposed vi-- 'tilineal in form, the lower portion converged forwardly and renewed backwardly and '-a downward thrust link providing the elements of a reversely breaking actuating coupling between the i key -lever and vibratorylever, an upper border pivot connecting the upper end of thedraw link to the vibra toryleverintermediatelythe-ends of thelatter at theupper border ref-an actuating plane, an intermediate pivot connecting the upper end .of the thrust link and'ikey lever arm within the backward concavity of jsaid=draw;link,;a

lower border pivot connecting thezdraw link and thrust link at the lower border of an actuating plane in the rear of a reversely breaking line drawn through the upper border pivot and the intermediate pivot, means operatively interlocking the elements of said coupling effecting response of the type bar to printing point upon depression of the key lever, means diverting the downward movement of saiu draw link forwardly actuating said lower border pivot and thrust link forwardly across and in front of the reversely breaking line moving the intermediate pivotal connection without the backward concavity of. said draw link out of operative interlocked position reversely breaking said coupling after printing impact of the type bar returning the vibratory lever, forward pull link and type bar to normal operative position while the key lever is in depressed position, means restoring said draw link, thrust link and lower border pivotal connection to normal interlo'cked position behind said reversely breaking line upon release of the key lever.

9. In a key action and mechanism, a type bar, a rearwardly disposed vibratory lever, a forward pull link operatively connecting the type bar and vibratory lever, a downward draw link actuating said vibratory lever, a downward thrust link actuating said draw link, a key lever providing an upward angular arm intermediately of its ends, a pivotal pin operating in an elongated hole or closed slot provided by said thrust link pivotally connecting said thrust link and key lever armthe head of said pin being elongated corresponding with the form of said slotsaid pin and slot connection effecting elongation of the reversely breaking actuating coupling permitting the momentum of the type bar to move the latter to printing point with relatively short depression stroke of the key lever permitting the type bar to complete its cycle of movement to printing point and back to normal position of rest by the actuation of substantially first-half of the key lever cycle or movement, means restoring the reverselybreaking actuating coupling to normal operative position of rest by the actuation of the second half of the key'levers cycle of movement. 7

10. In a key action and mechanism, a type bar, a key lever, means operatively connecting the type bar and key lever comprising a rearwardly disposed vibratory lever, a reversely breaking actuating coupling comprispact of the type bar upon relatively light depression stroke of the key lever, a fixed stop collar carried by the forward portion of said pull link communicating with the forward end of said actuating return spring, a slidable sleeve carried by said forward pull link communicating with the rear end of said spring controlling the tension thereof, an actuating thrust rod operatively connecting the draw link and slidable sleeve, a fixed stop collar carried by the rear portion of said forward pull link cummunicating with the rear of said slidable sleeve diverting the downward movement of said draw link for- Wardlv reversely breaking said coupling after printing impact of the type bar thereby energizing said spring for neutralizing the recoil impact concussion of said type bar, releasing the energy of said spring, sliding said sleeve backwardly, effecting backward movement of said actuating thrust rod, restoring said draw link and thrust link to normal operative position upon release of the key lever. Signed at Fort Collins, in the county of Larimer and State of Colorado, this 24th day of January, A. D. 192-8.

ORVILLE U. DESHA.

ing a downward draw link and'a downward thrust link operatively connecting the vibratory lever and key lever, a forward pull link operatively connecting the vibratory lever and type bar, an actuating return spring coiled about the circumference of the forward major portion of said pull link moving bodily forwardly and downwardly with said pull link, the tension thereof being dormant or ineffective and accelerating efficacious im- 

